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NTIS

07/24/2013

Collation

52p

Abstract

Section 303(d) of the Federal Clean Water Act (CWA) requires states to identify water bodies not meeting state water quality standards (WQS) and to develop total maximum daily loads for pollutants in those water bodies. A total maximum daily load (TMDL) is the amount of a pollutant a water body can assimilate without exceeding the established water quality standard for that pollutant. Through a TMDL, pollutant loads can be distributed or allocated to point sources and nonpoint sources (NPS) discharging to the water body. In July 1996, a water quality study was performed on Stone Dam Creek (ADEQ 1997). This investigation was conducted to determine the level of impact the point source dischargers to Stone Dam Creek were having on the water quality and aquatic inhabitants of the receiving stream. Results of this 1996 study concluded that several of the non-permitted constituents from the City of Conway Wastewater Treatment Plant (WWTP) cause a substantial change in water quality to Stone Dam Creek. In 1998, the States 303(d) list identified nutrients and ammonia as the pollutants of concern on Stone Dam Creek. In 2002, the 303(d) list specified nitrate and ammonia and identified a priority ranking for Stone Dam Creek of medium (ADEQ 2002).